Table 4.

Fixed effects of the linear mixed models (SI Appendix, Eq. S1) describing trends in the rate of stand-age–corrected biomass change

Data	Model	β	SE	P	n
All plots	Trend in rate of stand-age–corrected biomass change	−0.0473	0.0102	<0.0001	96
Western region	Trend in rate of stand-age–corrected biomass change	−0.0599	0.0114	<0.0001	70
Eastern region	Trend in rate of stand-age–corrected biomass change	0.0063	0.0229	0.7931	26

β is the slope and represents the annual rate of change in biomass, n is the number of forest plots used in the model, and P is the significance level for the model's fixed effects based on a t test.